Well, the Hijri date 20 Rabi Al Awwal 1437 corresponds to the Gregorian date Thursday, 31 December 2015. This date lies in the third month of the Hijri year 1437 AH, which is Rabi Al-Awwal of 1437 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1437/03/20 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 31 December 2015 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rabi Al Awwal 1437 AH to its equivalent Gregorian date.
فَأَثَٰبَهُمُ ٱللَّهُ بِمَا قَالُوا۟ جَنَّٰتٍۢ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَٰرُ خَٰلِدِينَ فِيهَا ۚ وَذَٰلِكَ جَزَآءُ ٱلْمُحْسِنِينَ
Allah hath rewarded them for that their saying - Gardens underneath which rivers flow, wherein they will abide for ever. That is the reward of the good.
Surah Al-Maaida(5:85)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: The dispatch of Usama bin Zaid to Al-Huraqat
Narrated Salama (in another narration):
I fought seven Ghazwat (i.e. battles) along with the Prophet (ﷺ) and also fought in nine battles, fought by armies sent by the Prophet (ﷺ) . Once Abu Bakr was our commander and another time, Usama was (our commander).
Sahih al-Bukhari 4271